C语言打开一个文件（有内容），倒序打印出文件中的内容

#include <stdio.h>#include <stdlib.h>#include <unistd.h>int main(int argc, char* argv[]){FILE * fp = NULL;char c = '0';int i;int file_size = 0;fp = fopen("student.c","r");if(fp == NULL){printf("open file error!\n");exit(EXIT_FAILURE);}fseek(fp,0,SEEK_END);file_size = ftell(fp);for(i = 1;i <= file_size;i++){fseek(fp,-i,SEEK_END);c = getc(fp);printf("%c",c);fflush(stdout);usleep(10000);}printf("\n");fclose(fp);return 0;}